39 



Fig. 21.— Elevated platform for making Bordeaux mixture. Tlie 

 water supply is merely indicated. In the absence of a water supply 

 in pipes a water tanls: may be used. Tiie materials flow by gravity 

 directly into tlie spraying tanic, wliich thus serves as the mixing 

 tanlc. 



barrel of water. Kerosene or whisky barrels will be found very con- 

 venient. The copper sulphate will all dissolve in from 12 to 18 hours 

 if suspended in a loosely woven sack, but if it is thrown loose in the 

 bottom of the barrel it will take several days and considerable stirring 

 to dissolve it. This makes a solution containing 2 pounds of copper 

 sulphate to each gallon of water. This may be kept as lon^ as desired 

 without deterioration, if covered so as to prevent evaporation. 



Lime solution. — The various kinds of ground and prepared lime 

 can not always be relied upon; stone lime is therefore to be preferred, 

 and is more likely 

 to give uniformly 

 satisfactory results. 

 Slake 100 pounds 

 of stone lime in a 

 50-gallon barrel, 

 adding the lime in 

 small quantities 

 with plenty of wa- 

 ter and mixing 

 thoroughly. When 

 the lime is all slaked 

 fill the remainder of 

 the barrel with wa- 

 ter. You will now 

 have a stock prep- 

 aration of lime 

 which when thor- 

 oughly mixed will 



bethin enough to dip and pour readily. Each gallon of this prep- 

 aration will contain 2 pounds of the stone lime. This may be kept 

 under coA^er and used as needed. Where large quantities of material 

 are being used it is desirable to have two or more barrels each of 

 stock lime and bluestone instead of one, so that the bluestone in one 

 barrel may be dissolving while that in the other is being used. 



Mixing Copper Sulphate Solution and Lime Solution. 



To prepare a 100-gallon spray tank of Bordeaux mixture, take 

 two 50-gallon barrels and fill them nearly fidl of water; to one barrel 

 add 5 gallons of the bluestone stock solution, which will be the equiva- 

 lent or 10 pounds of bluestone. To the other barrel add 5 gallons 

 from the barrel of the stock lime preparation, which will be equal 

 to 10 pounds of stone lime. Mix the lime thoroughly and allow the 

 contents of the two barrels to run together into a trough, or through 

 hose attached at the bottom of the barrels into the tank of the sprayer, 

 as shown in the illustration (fig. 21). 



If an insecticide is to be used, it may now be added to the mixture. 



After the mixture is prepared it should be used very soon, and not 

 be allowed in any case to stand more than a few hours before using. 



The quantities mentioned in this account of the preparation of 

 Bordeaux mixture will give 100 gallons of the 5-5-50 formula. For 

 the other formulas, the manner of preparation is precisely the same, 

 and the necessary changes in quantities of bluestone and lime are 

 easily calculated. 



2S4 



